Incubator.



CHRISTIAN G. LEHMANN, or DETROIT, MICHIGAN.

INCUBATOR.

`Specification of Letters Iatent.

Patented Dec. 3., 1912.

Application led May 9, 1912. Serial N o. 696,071.

To all whom t may concern Be it known that T, CHRISTIAN MANN, asubjectofthe Emperor of Germany, residing at Detroit, in the county of 5 Wayneand State of Michigan, have invented certain new and useful Improvementsin Tncubators, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to improvements iig incubators and moreparticularly to mea for regulating the heat for such devices.

The object of the invention is toprovide simple and efficient meansoperated by the temperature within the incubator for accuratelycontrolling the heating apparatus whereby ,an even temperature ismaintained within the incubator and further to provide certain other newand useful features in the construction and arrangement of parts all ashereinafter more fully described and particularl y pointed out in theclaims reference bein had to the accompanying drawings, in whic Aextends across the casing longitudinally thereof near one side, thenceacross the casing near one end and back the length of the casing to anoutlet opening 5 in the top of the casing which opening is controlled bya slide 6. This slide may be moved by the operator to close or open theoutlet as de-` sired.

The ue 4 is provided with an outlet 7 outside of the casing 1 and nearthe vertical portion of the flue which extends downward into the chimney3 ofthe heater. Adjacent to one side of this outlet 7 is pivoted adamper 9 which is adapted to swin downward across the flue l and close tesame against the passage of heat into the incubator casing. If desiredthis damper may be turned to close the outlet 7 when the heat 5 passingthrough the passage 4 will all be forced to pass through the flue intothe cas- Figure 1 is a longitudinal vertical section v ing. As shown inFig. 1 the damper may be set in an inverted position when part of theheat will pass out through the outlet 7 and part will pass the damperand enter the cas ing. The amount of heat entering the incubator maythus be accurately regulated by turning the damper and to so turn thedamper and to automatically regulate the heat a thermostat 10 issupported within the chamber of the incubator to engageand operate alever 11 which is pivoted at 12 intermediate its ends and extendsdutward through an opening 13` in the end wall of the casing 1. Securedto the pivot or shaft 14 of the damper 9 lis a lever 15 having a weight16 at one end and a pointer 17 at its opposite end. A scond lever 18extends substantially at right angles to the lever 15 with one endengaged therewith and its opposite end -connected to the outer end ofthe lever 11 by means of a connecting rod 19. The lever 18 is pivotedintermediate its ends at 20 to a suitable supporting bracket on the endof the casing. An indicator plate 21 is adjustably secured to the sideof the fiue 4 by means of a screw 22 engaging a curved slot 23 in theplate.- This plate is provided with marks over which the pointer 17moves. The connecting rod 19 passes through an eye or opening in the endof the lever 11 and is screwthreaded at its lower end to receive anadjustable thumb nut 24 so thatv the length of the rod may be accuratelyadjusted as desired. y f

As the heat within the incubator chamber increases, the thermostat 10will be expanded thereby and the lever 11 rocked upon its pivot causingthe outer end of the lever to move downward bringing its end intoengagement with a nut 24 and pulling upon the rod 19. This'pull uponsaid rod will Arock the lever 18 upon its pivot 20 and bring its endinto engagement with the lever 15 which lever will in turn be lifted,turning the damper 9 downward across the flue and cutting off thepassage of the heat from the heater into the incubator chamber. Thisoperation will at the same time be indicated by t-he pointer 17 movingover the graduations on lthe plate2'1.

When the temperature in the chamber of the incubator falls, thethermostat will convtract permitting the inner end of the lever 11 tofall by Jfgravity and its outer end to raduations and indicating Theweight 16 will then operate to turn the lever l5 and' swing the damper 9upward until the downward movement of said lever 15 is arrested by thelever 18 which in turn is held by t-he nut on the rod 24 coming in-contactv with the outer end of the lever 11.

The damper- 9 is thus swung upwardly as the temperature in the casingfalls and more heat will be admitted to the casing through the flue.

vThe device maybe set by means of the thumb nut 24 so that it willoperate toturn the damper and maintain the temperature in the casing atany desired degree. When the temperature within the casing is normalI'or at the point at which the device is s'et to perate and maintainsuch temperature, the pointer 17 will be in mid position of the plateorat zero, said plate being adjusted by means of its screw 22 when thenut 24 is adjusted to change the normal degree of temperature within thecasing so that when said temperature is at the desired or normal pointthe pointer will be at zero. Any variation rom the degree of temperatureat which the device is set to operate will thereafter be indicated bythe pointer 17 being deflected one way or the other from the zero mark.

Obviously, changes may be made in the construction and arrangement ofparts with outl` departing from the spirit of my invention and I do notWish to limit myself to the particular form or construction shown.

Having thus fully described my invention what I claim is v 1. Inl anincubator, the combination with a casing, an air flue extendinghorizontally into and across the casing and provided with an outletthrough the top of the casing, a

heater connected to the outer end of the air flue outsideof the casing,said air :Hue being provided with an outlet opening adjacent to said endto'which the heater is connected, a vdamper pivoted within the air flueto swing across the same and across the outletopening, a leverconnectedto the damper to turn the same and provided with a, pointer, a v

vdamper pivotally supported within the air flue `to be turned across thesame and across the outlet opening in said flue, a weighted leverattached to said damper, a lever pivotally supported upon the casingintermediate its ends with one end engaging the weighted lever, athermostat within the casing, a lever pivoted intermediate its endswithone end engaged by the thermostat, a rod connected to the free end ofthelever pivotally supported upon the casing and adjustably connected atits opposite end tothe free end of the lever engaged by the thermostat,a

pointer carried' by the damper, and .an indicator plate adjustablysupported adjacent to the pointer.

In testimony whereof I atIiX my signature in presence of two witnesses.

CHRISTIAN G. LEHMANN. Witnesses q LEWIS E. FLANDERS, ANNA M. Donn.

